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Akbar Sujiwa
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akbarsujiwa.ft@upnjatim.ac.id
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Jl. Rungkut Madya, Gn. Anyar, Kec. Gn. Anyar, Surabaya, Jawa Timur 60294
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Faraday: Journal of Fundamental Physics, Research, and Applied Science
Published by Universitas Pembangunan Nasional Veteran Jawa Timur
ISSN : -     EISSN : 31091318     DOI : https://doi.org/10.33005/faraday.v1i1
Core Subject : Science, Engineering,
Computer Science & IT Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Faraday: Journal of Fundamental Physics, Research, and Applied Science publishes original articles on developments and research in both Classical and Modern Physics, encompassing theoretical studies, experimental investigations, and practical applications. The journal places particular emphasis on contributions that highlight the Indonesian context while also engaging with the global scientific community. Its scope includes, but is not limited to: Instrumentation Physics and Measurement—covering sensor systems, control systems, biomedical engineering, and nuclear instrumentation; Materials Science—with a focus on synthesis and characterization techniques, advanced materials, low-temperature physics, and exotic materials; Theoretical and Computational Physics—including high energy physics, gravitation and cosmology, astrophysics, nuclear and particle phenomenology, and computational and non-linear physics; as well as Earth Sciences, particularly in the areas of geophysics and astronomy.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 12 Documents
 1   2 
The Impact of Plate Length and Material Variations on Tibial Bone Implants Analysis using Computational Biomechanics Sakinah, Sakinah; Wardhani, Primasari Cahya; Rizkiarna, Reffany Choiru; Aminallah, Deliana Nurfauziyyah; Aruan, Nenni Mona; Billah, Zakiyah Dania
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 1 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i1.2

Abstract

The aim of this research is to simulate the strength of the implant plate, as a method for healing tibia fractures by combining bone with a bone plate. Then model and analyze using ANSYS software to analyze loads such as deformation and the maximum distribution of von Mises stress values. The results of the Maximum Principal Stress analysis on the cobalt-chromium implant plate show a minimum value of -1.2527107 Pa (-12.527 MPa) and a maximum value of 7.57610 7Pa (75.76 MPa). Based on the research results, Co-Cr material has significant advantages compared to steel as an implant material. In addition, this material has excellent corrosion resistance and very good biocompatibility, making it safe for long-term use in the human body without significant risk of allergic reactions or irritation.
Comparison of Stress and Deformation Distribution in Steel and Cobalt Chromium Materials for Femoral Bone Implants using Computational Biomechanics Analysis hardiantati, hamizatul; Wulan, Widya Rachma; Timur, Fajar; Hasan, Nailul; Fauziyah, Nur Aini
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 1 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i1.3

Abstract

This study analyzes the mechanical performance of femoral bone implants using two types of materials, namely Alloys and Cobalt Chromium Alloys, as well as two variations in implant length (72 mm and 24 mm, and 80 mm and 20 mm). Simulation was conducted using the Finite Element Method (FEM) to evaluate mechanical parameters, such as directional deformation, equivalent stress, maximum principal stress, and minimum principal elastic strain. The analysis results show that the Cobalt Chromium Alloys material has smaller deformation compared to the Alloys, indicating better stiffness and load-bearing capacity. However, the maximum principal stress value is higher in Cobalt Chromium Alloys, indicating a greater risk of stress concentration. Meanwhile, a longer implant length shows a more even stress distribution compared to a shorter length. This study provides important insights into the influence of material and implant length on its mechanical performance, and can serve as a basis for designing optimal implants for specific medical needs
The Effect of Inaccurate Electronic Component Values on The Output Frequency Characteristics of Fourth Order Butterworth Type Low-pass Filter Circuits Sujiwa, Akbar; Maniani, Billy Sopater
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 1 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i1.4

Abstract

The low-pass filter opamp circuit is an active electronic circuit used to pass low frequencies. In practice, making this circuit requires active components in the form of an operational amplifier and several passive components such as resistors and capacitors. To obtain the required passive component values, calculations are carried out according to theory, but the results of these calculations sometimes make it difficult for users to find the values ​​for the same components. Components sold on the market do not always exactly match the user's needs, so sometimes these components are replaced with components whose size is close to the calculated value. Therefore, in this research, testing was carried out regarding the effect of inaccurate component values ​​on the filter output characteristics. From the results of this research, it was found that the cut-off frequency decreased by 6.25% and that premature damping occurred at low frequencies at 100 Hz. However, overall this series of filters is still suitable for use.
Effectiveness of Science (Physics) Teacher Training Program on Conceptual Understanding at MTs Manado Hasan, Nailul; Aruan, Nenni Mona; Fauzyah, Nur Aini
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 1 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i1.5

Abstract

This study aims to evaluate the effectiveness of the physics science teacher training program in improving the understanding of physics concepts at one of the Madrasah Tsanawiyah (MTs) in Manado. Using pre-test and post-test data from 52 teachers, the Wilcoxon Signed-Rank Test was analyzed. The results showed significant improvement in trainees' understanding of physics concepts, with a p-value of 0.0004 and a large effect size (r = 0.60). These findings provide empirical evidence that the training is effective in improving teachers' conceptual understanding and can be used as a basis for developing similar programs in other regions.
Monitoring of Raw and Treated Water Quality Based on Nitrate Parameter at Ngagel Water Treatment Plant Using Spectrophotometry Method Sudrajat, Oka Akbar; Wardhani, Primasari Cahya; Timur, Fajar; Pravitasari, Rizky; Rizkiarna, Reffany Choiru; Perwitasari, Devina Rayzy
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 1 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i1.6

Abstract

This research focuses on monitoring the water quality at the Ngagel Water Treatment Plant in Surabaya by analyzing the nitrate (NO₃⁻) content in both raw and treated water. Nitrate is a key indicator of water pollution, often originating from agricultural runoff, sewage, and industrial discharge. Samples were collected monthly from January to March 2024 at two locations: the raw water intake from the Surabaya River and the treated water output ready for distribution. Laboratory testing using spectrophotometric methods showed that nitrate levels in raw water ranged between 2.44 mg/L and 3.50 mg/L, while treated water showed a slightly lower range between 2.00 mg/L and 3.00 mg/L. These results indicate a consistent reduction in nitrate concentrations after treatment, demonstrating the efficiency of the Ngagel Water Treatment Plant’s processes. Importantly, all measured values were significantly below the maximum allowable limit of 50 mg/L, as stated in the Indonesian Ministry of Health Regulation No. 492/MENKES/PER/IV/2010. This confirms that the treated water is safe for human consumption with regard to nitrate levels. The study highlights the importance of continuous water quality monitoring to ensure public health protection and to maintain the effectiveness of water treatment facilities over time.
Implant Design Femur Bone using CAD Computation with Variation in Implant Plate Length Az Zahra, Ladya Cheril; Sudrajat, Oka Akbar; Santika, Arum Sinda; Ernawati, Dira; Sujiwa, Akbar
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 1 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i1.9

Abstract

Femoral fractures are among the most common and severe musculoskeletal injuries, necessitating effective and reliable treatment strategies. This study explores the biomechanical performance of femur implants by evaluating the effects of material selection and implant design using the finite element method (FEM). Three biocompatible materials—titanium alloy Ti-6Al-4V, stainless steel, and PEEK—were analyzed under linear elastic isotropic conditions. Implant designs varied in length (10.02 mm, 13.37 mm, and 15.60 mm) with a fixed head thickness of 3 mm. Simulations assessed stress distribution, deformation, and overall structural performance under physiological loading conditions. Results demonstrated that implant length significantly affects mechanical behavior. The 15.60 mm implants exhibited the most uniform stress distribution and minimal deformation, indicating superior mechanical stability. In contrast, shorter implants (e.g., 10.02 mm) showed increased stress concentrations and deformation, suggesting a higher risk of mechanical failure. Among the materials tested, Ti-6Al-4V outperformed others due to its favorable combination of strength and biocompatibility. The study concludes that longer implants made from titanium alloy provide improved structural integrity, offering safer and more durable options for femoral fracture repair. These findings contribute to the optimization of implant design for enhanced clinical outcomes in orthopedic applications
Characterization of RF Voltage and Self-Bias under Power Variations in 13.56 MHz RF Sputtering System Aprilia Dewi Ardiyanti; Siregar, Aslam Chitami Priawan; Tamimah, Ni’matut
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.13

Abstract

RF Sputtering has been widely used as a deposition system on thin films. This study examines the impact of input power on RF voltage and self-bias voltage in an RF Sputtering system operating at a frequency of 13.56 MHz. Power variations were carried out in the range of 50 to 150 Watts to observe the changes in voltage produced during the plasma formation process. The experimental results indicate a linear dependency between power and both voltages, with a coefficient of determination (R²) above 0.9 and slope values of 2.86 and 0.96 for the RF voltage and self-bias voltage, respectively. The observed linear correlation indicates that adjusting power regulation can be utilized as an effective control parameter for both voltages, enabling the production of uniform and high-quality thin film deposition.
Review: Characterization of Optical and Structural Properties of Carbon Nanodots (CNDs) from Biomass Waste by Microwave Method Putriana, Ima; Aruan, Nenni Mona; Riskiarna, Reffany Choiru; Fauziyah, Nur Aini; Santika, Arum Sinda
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.14

Abstract

This review focuses on examining the synthesis and characterization of Carbon Nanodots (CNDs) from the utilization of Tandan Kosong Kelapa Sawit (TKKS) using the microwave method as an environmentally friendly approach. The resulting CNDs were characterized for their optical and structural properties to evaluate their potential application in the field of biosensors. The synthesis process involves carbonizing TKKS at 500℃ for 3 hours, followed by activation using a microwave at 450 Watts for 15 minutes. UV-Vis characterization shows an absorption peak at 280 nm, which indicates n-π* (C=O) and π-π* (C=C). Meanwhile, FTIR characterization aims to determine the presence of the carbonyl C=O functional group at 1990,98 cm-1 and the aromatic C=C bond at 1416,2 cm-1. The CNDs from TKKS exhibit photoluminescent properties and surface functional groupss that enhance adsorption performance and chemical reactivity. This research offers an efficient and sustainable method for synthesizing CNDs, while also being a breakthrough in utilizing biomass wate, particularly TKKS. The findings have the potential for developing carbon materials in environmental and energi applications.
Rooftop PV System Optimization in an Educational Building Using SAM: A Case Study at UPN Veteran Jawa Timur Setiawan, Yofinda Eka; Hilmi, Allif Rosyidy
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.17

Abstract

The implementation of sustanable energy in educational institutions recognizes the potential of rooftop photovoltaic (PV) systems as a viable energy source. This research aims to evaluate and optimize the design of a rooftop photovoltaic (PV) system for Building 1 of the Fakultas Teknik dan Sains (FTS) at Universitas Pembangunan Nasional "Veteran" Jawa Timur (UPNVJT) using the System Advisor Model (SAM) software. Integrated data including meteorological data, building characteristics, and solar panel system specifications were utilized. The available rooftop area for PV system installation is approximately 200 m² with a north-facing orientation, which is estimated to accommodate a 30 kWp PV system capacity. Tilt angle and azimuth scenarios were varied to achieve maximum energy production. Based on SAM simulations, the optimal installation angle of 15° tilt and azimuth generated an annual energy output of 44,052 kWh with a performance ratio of 71% and a capacity factor of 17%. This study confirms that rooftop PV installation at FTS UPNVJT is technically feasible, and it is expected to serve as a foundation for the gradual implementation of PV systems as part of green campus initiatives and energy transition in educational institutions.
Earthquake Analysis Using the Probabilistic Seismic Hazard Analysis (PSHA) Method in Palu City Jayadi, Harsano; Meidji, Icha Untari; Hidayat, Irna; Abdullah
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.18

Abstract

Palu, Indonesia, is a region with high seismic activity due to its location on the active Palu-Koro fault line. This study aims to analyze the probability of earthquakes, the spatial and temporal distribution of earthquake occurrences, and disaster mitigation efforts in anticipation of earthquakes in the region. Earthquake data in Palu City were analyzed based on magnitude, depth, and frequency of occurrence. The results indicate that most earthquakes occur at shallow depths ranging from approximately 10 to 56.8 kilometers, with a dominance of moderate magnitude (5.0–5.7 M_w). Over the past two decades, there has been an increase in the temporal occurrence of earthquakes, with a significant surge in 2018 when a magnitude 7.5 earthquake triggered a tsunami and liquefaction. Probability analysis indicates that earthquakes with high seismicity indices are highly likely to occur within a 10- to 50-year timeframe. The spatial distribution reveals that earthquakes tend to be concentrated around the Palu-Koro fault, the primary source of seismic activity in the region. These findings provide important insights into the seismic patterns of Palu City and can inform community preparedness and disaster mitigation strategy development.

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